Putative sugar aminotransferase Spr1654 from Streptococcus pneumoniae, apo-form

Experimental Data Snapshot

  • Resolution: 1.90 Å
  • R-Value Free: 0.265 
  • R-Value Work: 0.236 
  • R-Value Observed: 0.238 

wwPDB Validation   3D Report Full Report

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Structural and functional studies of Spr1654: an essential aminotransferase in teichoic acid biosynthesis inStreptococcus pneumoniae.

Han, X.Sun, R.Sandalova, T.Achour, A.

(2018) Open Biol 8

  • DOI: https://doi.org/10.1098/rsob.170248
  • Primary Citation of Related Structures:  
    6EWJ, 6EWQ, 6EWR

  • PubMed Abstract: 

    Spr1654 from Streptococcus pneumoniae plays a key role in the production of unusual sugars, presumably functioning as a pyridoxal-5'-phosphate (PLP)-dependent aminotransferase. Spr1654 was predicted to catalyse the transferring of amino group to form the amino sugar 2-acetamido-4-amino-2, 4, 6-trideoxygalactose moiety (AATGal), representing a crucial step in biosynthesis of teichoic acids in S. pneumoniae We have determined the crystal structures of the apo-, PLP- and PMP-bound forms of Spr1654. Spr1654 forms a homodimer, in which each monomer contains one active site. Using spectrophotometry and based on absorbance profiles of PLP- and PMP-formed enzymes, our results indicate that l-glutamate is most likely the preferred amino donor. Structural superposition of the crystal structures of Spr1654 on previously determined structures of other sugar aminotransferases in complex with glutamate and/or UDP-activated sugar allowed us to identify key Spr1654 residues for ligand binding and catalysis. The crystal structures of Spr1654 and in complex with PLP and PMP can direct the future rational design of novel therapeutic compounds against S. pneumoniae .

  • Organizational Affiliation

    Science for Life Laboratory, Department of Medicine Solna, Karolinska Institute, Solna, 17176 Stockholm, Sweden.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Putative capsular polysaccharide biosynthesis proteinA,
B [auth D],
D [auth B]
427Streptococcus pneumoniae TIGR4Mutation(s): 0 
Gene Names: SP_1837Spr1654
Find proteins for A0A0H2URM1 (Streptococcus pneumoniae serotype 4 (strain ATCC BAA-334 / TIGR4))
Explore A0A0H2URM1 
Go to UniProtKB:  A0A0H2URM1
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0A0H2URM1
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.90 Å
  • R-Value Free: 0.265 
  • R-Value Work: 0.236 
  • R-Value Observed: 0.238 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 79.33α = 90
b = 99.982β = 97.66
c = 110.422γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
Aimlessdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2018-05-02
    Type: Initial release
  • Version 1.1: 2024-01-17
    Changes: Data collection, Database references, Refinement description